Add CRL (revocation list) checking option to client cert check #124
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CRL checking is essential part of safe PKI.
Revocation list can be appended to end of pure-ftpd.pem file.
Use case: trusted CA generates server and client certs, and at some point CA revocates the client cert (server should start rejecting the client, which it currently doesn't do). This patch fixes a bug that revoked client cert could still login.
By adding -R:-C: options to chipherlist, it starts checking the CRL list which has been appended to end of pure-ftpd.pem